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Leases - Supplemental Cash flow Information to operating leases (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Supplemental cash flow information      
Cash paid for amounts included in the measurement of operating lease liabilities $ 4,258 $ 4,242  
Operating ROU assets obtained in exchange for lease liabilities 290 $ 388  
Supplemental balance sheet information      
Operating lease ROU assets 36,926   $ 40,049
Operating lease liabilities:      
Accrued expenses and other current liabilities 7,306   7,079
Operating lease liabilities 30,776   34,242
Total operating lease liabilities $ 38,082   $ 41,321